USB C is an open specification used by many mobile devices like phones, tablets and laptops. It is an open specification because it is not proprietary to any single company and instead can be used in products by any vendor. A key feature is USB-C is that it is reversible while previous USB versions were not.
USB-C (properly known as USB Type-C; commonly known as just Type-C) is a 24-pin USB connector system with a rotationally symmetrical connector. The designation C refers only to the connector's physical configuration or form factor and should not be confused with the connector's specific capabilities, which are designated by its transfer specifications (such as USB 3.2). A notable feature of the USB-C connector is its reversibility; a plug may be inserted into a receptacle in either orientation.
The USB Type-C Specification 1.0 was published by the USB Implementers Forum (USB-IF) and was finalized in August 2014. It was developed at roughly the same time as the USB 3.1 specification. In July 2016, it was adopted by the IEC as "IEC 62680-1-3".A device with a Type-C connector does not necessarily implement USB, USB Power Delivery, or any Alternate Mode: the Type-C connector is common to several technologies while mandating only a few of them.USB 3.2, released in September 2017, replaces the USB 3.1 standard. It preserves existing USB 3.1 SuperSpeed and SuperSpeed+ data modes and introduces two new SuperSpeed+ transfer modes over the USB-C connector using two-lane operation, with data rates of 10 and 20 Gbit/s (~1.2 and 2.5 GB/s).
USB4, released in 2019, is the first USB transfer protocol standard that is only available via USB-C.